What Are The 7 Types of ACB (Air Circuit Breaker)?

Distributors need to know their products—such as Air Circuit Breakers (ACBs)— to provide excellent customer service, offer technical support, and guarantee compliance with standards.

In this article, we will discuss the various types of ACBs to shed light on their unique features and applications. This way, customers can understand what they and decide which one they need.

What is the purpose of the ACB?

The ACB or air circuit breaker gives low-voltage circuits protection against electrical faults, such as short circuits and overloads.

ACBs automatically disconnect the electrical circuit when the device detects abnormalities, which prevents further damage and hazards like fire.

7 Types of Air Circuit Breakers (ACBs)

Plain Break ACB

Plain Break ACB is the most basic and traditional type of ACB circuit breaker. It works by using a pair of contacts to create a gap in the electrical circuit to interrupt the flow of current. It remains a reliable choice for applications that don’t require advanced features.

Magnetic Blowout ACB

Magnetic Blowout ACBs use a magnetic field to enhance the arc extinguishing process. The magnetic force generated helps to elongate the arc, making it easier to extinguish. This type of ACB is particularly effective in dealing with high currents and provides better protection against short circuits.

Air Chute ACB

Air Chute ACBs utilize an air chute to guide the arc towards an arc runner, which then leads the arc into an extinction chamber. This design enhances the cooling and extinguishing capabilities of the breaker. 

Axial Blast ACB

Axial Blast ACBs have a mechanism that directs the blast of air axially along the arc path. This focused blast helps in the rapid cooling and extinguishing of the arc. 

Drawout ACB

Drawout Air Circuit Breaker is designed for ease of maintenance and replacement. Its modular construction allows the entire breaker to be withdrawn from its housing for inspection or repair without affecting the rest of the system. 

Uncompensated ACB

Uncompensated Air Circuit Breakers are characterized by the absence of any compensating coil in their design. They rely on the thermal and magnetic properties of the air arc for interruption. 

Static Trip ACB

Static Trip ACBs are equipped with electronic trip units that provide precise control and monitoring functions. These trip units offer features such as adjustable trip settings, digital displays, and communication capabilities. 

What are the advantages of air circuit breakers?

Air circuit breakers have various advantages not just in protecting electrical circuits from damage.

#1: Breaks High Fault Currents

Air circuit breakers can be used in industrial and commercial settings that utilize large electrical power, such as apartment complexes, factories, etc.

#2: Provides User Convenience

Users can easily configure or adjust the device’s settings, such as time delay and trip current, depending on the application and requirement.

#3: Boasts Ease of Maintenance

Most air circuit breakers have easily removable features and mechanisms that don’t interrupt an electrical system during testing, inspection, or replacement.

#4: Long Product Service Life

Thanks to their long service life, air circuit breakers can be replaced every 10-15 years depending on performance, external conditions, and manufacturer.

What ACB Circuit Breaker Type Do You Need?

The different ACB breaker types have different features and applications—which one of them suits your electrical requirements?

If you’re looking for premium ACB circuit breakers, contact us today to learn more or get a free quote.

More FAQs About Air Circuit Breakers (ACBs)

What is the difference between a circuit breaker and an air circuit breaker?

A circuit breaker also works by interrupting the electrical flow when abnormal flow is detected just like air circuit breakers. However, air circuit breakers specifically utilize air as the so-called arc-extinguishing factor that makes it suitable for both low and high-voltage settings.

What are the benefits of air circuit breakers?

Air circuit breakers have a simple structure, configuration, and overall function. Plus, ACBs do not have complicated maintenance and can last up to 15 years depending on usage. These devices also have robust quality, especially in harsh conditions.

What is the working principle of an air break circuit breaker?

Air circuit breakers work by separating contacts in an air chamber. When the contacts are open, an arc forms and is quickly put out by air, which then breaks the current flow to protect the circuit.

Where are air circuit breakers used?

Air circuit breakers are mainly used in industrial and commercial settings, especially power distribution systems. These devices prevent circuit damage and potential hazards in small or large buildings for optimal power distribution and safety.

What causes an ACB to trip?

An air circuit breaker can trip due to overcurrent, short circuits, ground faults, or equipment malfunctions. Trip mechanisms detect excessive current flow or abnormal conditions, activating to protect the circuit. Environmental factors like moisture or dust can also contribute to tripping in sensitive installations.

Which relay is used in ACB?

Overcurrent relays are typically used in air circuit breakers. These relays detect excessive current levels and initiate tripping to interrupt the circuit, thereby protecting connected equipment from damage. Different relay types, such as thermal, magnetic, or digital relays, may be used depending on application needs.

What is the defect in an air circuit breaker?

Common defects in air circuit breakers include contact wear, insulation degradation, and mechanical failure. Dust accumulation or improper maintenance can lead to reduced performance, while excessive arc formation during switching can erode contacts, reducing the breaker’s reliability and potentially causing malfunction.